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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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12K8 vacuum tube outline illustration

Tube-number record

12K8

0 archive entries

12K8 is a tube type in the TubeDatabase archive (class: Triode-Hexode Converter). Recorded specifications: brand General Electric, year 1946, construction Multi-section, base Phenolic, socket Octal, maximum plate voltage 300 V, and maximum plate dissipation 0.75 W. The archive does not yet hold a photographed example of this type.

BrandGeneral Electric
ClassTriode-Hexode Converter
BaseOctal
Filament12.6 V @ 150 mA

Construction

Primary TypeMulti-section
EnvelopeMetal Shell, MT-8
Base MaterialPhenolic
Sections2

Filament / Heater

Heater NotesA-C or D-C

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Converter Service (100V)100 V325400000—2.3 mA
Converter Service (250V)250 V350600000—2.5 mA

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    Plate Voltage300 V
    Plate Dissipation0.75 W
    Grid 2 Voltage150 V
    Cathode Current16 mA

    Audio Performance

    Key Features
    • Metal type
    • Coated Unipotential Cathode
    • Superheterodyne circuits
    • All-wave type